EP0553560B1 - Système de communication - Google Patents

Système de communication Download PDF

Info

Publication number
EP0553560B1
EP0553560B1 EP92311577A EP92311577A EP0553560B1 EP 0553560 B1 EP0553560 B1 EP 0553560B1 EP 92311577 A EP92311577 A EP 92311577A EP 92311577 A EP92311577 A EP 92311577A EP 0553560 B1 EP0553560 B1 EP 0553560B1
Authority
EP
European Patent Office
Prior art keywords
copy
data
objects
shared
store
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92311577A
Other languages
German (de)
English (en)
Other versions
EP0553560A2 (fr
EP0553560A3 (en
Inventor
Steve John Atkins
Jeffrey Norman Froggatt
Leonard William Parker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GPT Ltd
Plessey Telecommunications Ltd
Original Assignee
GPT Ltd
Plessey Telecommunications Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GPT Ltd, Plessey Telecommunications Ltd filed Critical GPT Ltd
Publication of EP0553560A2 publication Critical patent/EP0553560A2/fr
Publication of EP0553560A3 publication Critical patent/EP0553560A3/en
Application granted granted Critical
Publication of EP0553560B1 publication Critical patent/EP0553560B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46—Multiprogramming arrangements
    • G06F9/465—Distributed object oriented systems

Definitions

  • This invention relates to an object orientated system.
  • 'process' is used universally in software circles to mean a portion of software that is running concurrently with other processes on the same machine, i.e. the execution of instructions within a process is not dependent upon the initiation or completion of instructions within another process. This concurrency is usually achieved by using a multitasking operation system to share system processing time between the processes. If such a sharing mechanism is not provided there can only be one process per machine.
  • this object may be thought of as a shared object.
  • an alternative is to create a copy of this shared object in each of the processes that wish to access it. All messages passing to the shared object appears to be within the same process, in addition there is no serialization of the messages on a queue, i.e. concurrency is preserved. This sounds ideal except that in order for this shared object to be a shared object each copy within each process must be exactly the same.
  • An object is characterised by both its internal data and its methods (the functions which act upon its internal data in response to arriving messages).
  • An object's internal data is usually dynamic and varies with time.
  • the object's methods are more static, usually being defined at system build time (or earlier) and do not vary during the system's lifetime Therefore, when copies are made of a shared object it is only the internal data which must be kept consistent. If the methods used within a process only result in read operations on the shared object's internal data then there is no problem. However, if the methods activated result in internal data change, i.e. write operations, then such changes must be made to every copy of the shared object to maintain consistency.
  • Persistent objects are stored in non-volatile memory. To activate an object it is necessary to copy it from non-volatile to volatile memory. The copy in volatile memory is then assessed. If access involves altering data, the altered volatile copy is used to update the non-volatile copy when access terminates normally. Should crash occur while the volatile copy is in use, the non-volatile copy can be used to restore operation.
  • the replicated objects are thus configured so as to be functionally equivalent to a single object, and any changes are immediately conveyed to all replicated copies via their respective client-server processes. While this does maintain consistency, it does required the provision of a dedicated client-server process for each replicated copy to allow for the possibility of data change.
  • the shared object approach of the present invention addresses the problem of concurrency as this is maintained via the multiple copies of the shared object. Inter-process messaging is still employed, but only when a shared object method resulting in internal data change is utilised, faster intra-process messaging being used for all other methods. The problem of allocating objects to server processes and the performance problems associated with this are eliminated. This is not to say that the client-server model should not be used - there are still circumstances where it would be sensible to use this arrangement over a Shared Object approach. In addition the shared object approach also has some potential drawbacks, namely:-
  • a first aspect of the invention provides a method of operating an object-oriented system, the system comprising:
  • a second aspect of the invention provides an object-oriented system comprising:
  • the data for a shared object may be updated by processes that are currently actually accessing the shared object.
  • a notification mechanism (BOUing) is used to inform other processes that the object has changed. These processes are then responsible for a re-reading the shared objects' data if necessary. No data is transported by the BOUing mechanism.
  • the standard implementation of a client-server approach is to employ small pieces of code (sometimes termed message stubs) in the client and server processes which interface with some form of inter-process communications (IPC).
  • IPC inter-process communications
  • the purpose of the code in the client process is purely to relay any requests on the object in the server process as messages to the server process using the IPC mechanism.
  • the IPC mechanism will queue messages at the server process, with the small amount of code in the server process reading this queue and directing the requests to the object to service them.
  • the whole process can be thought of as a pipe which takes in requests at one end from the client process(es) and delivers them at the other end of the pipe to the appropriate object in the server process. All activity required to service the requests (rather than merely transport it) is handled in the server process.
  • the implementation of the shared object approach replaces the client-server 'pipe' with a mechanism which deals with requests locally within the process using the shared object. When such requests modify the internal data of the shared object, only then will inter-process communications be utilised to ensure other copies of the object are brought into alignment with the changes.
  • Objects that are to be shared within a system must be identified as such at compile time. This is achieved by defining a shared object class from which objects wishing to exhibit this characteristic may inherit. Whenever a shared object is created, a copy of that object is created within the requesting process. If this is the first time that object is created then two additional items are created; a copy of the object's data is created in share memory along with a used-by table into which an identifier for the requesting process is written. Subsequent creations of this shared object by other processes will result in a copy of the object being created within the requesting process whose internal data will be an exact copy of the data stored in shared memory, and the used-by table is updated with the requesting processes' ID.
  • the shared memory can be thought of as a global data area accessible from any process.

Claims (4)

  1. Procédé d'exploitation d'un système orienté objet, le système comprenant :
    un dispositif de mémorisation d'un objet comprenant des données modifiables, et
    un dispositif destiné à transmettre une copie de l'objet à au moins un processus distant du dispositif de mémorisation de l'objet, chaque processus au moins comprenant un dispositif respectif de mémorisation de la copie de l'objet,
    le procédé comprenant les étapes suivantes :
    la transmission d'une copie de l'objet à au moins un processus distant du dispositif pour la mémorisation de l'objet,
    la mémorisation de la copie de l'objet dans un dispositif respectif de mémorisation,
    la modification des données modifiables de l'objet,
    la communication de l'existence de la modification au processus ou à chaque processus distant qui possède une copie de l'objet, et
    la transmission au processus ou à chaque processus distant d'une copie des données modifiées à la suite d'une requête provenant du processus ou de chaque processus distant, comprenant les données modifiées.
  2. Procédé selon la revendication 1, comprenant en outre les étapes suivantes :
    la modification des données modifiables de la copie de l'objet, et
    la communication des données modifiées de la copie de l'objet, si bien que l'étape de modification des données modifiables modifie les données modifiables de l'objet afin qu'elles correspondent aux données modifiées contenues par la copie de l'objet.
  3. Système orienté objet, comprenant :
    un dispositif de mémorisation d'un objet comprenant des données modifiables,
    au moins un dispositif de mémorisation d'une copie de l'objet dans un processus distant du dispositif de mémorisation d'un objet,
    un dispositif destiné à modifier les données modifiables de l'objet,
    un dispositif destiné à informer le dispositif de mémorisation d'une copie de l'objet au moins du fait que les données modifiables de l'objet ont été modifiées, et
    un dispositif destiné à donner une copie de l'objet sous forme d'une copie des données modifiées de l'objet à la suite d'une requête provenant d'un processus distant dans lequel la copie de l'objet est conservée afin qu'elle soit remplacée par une copie des données modifiées.
  4. Système selon la revendication 3, comprenant :
    un dispositif destiné à modifier les données modifiables d'une copie de l'objet,
    dans lequel le dispositif destiné à modifier les données modifiables de l'objet modifie les données modifiables de l'objet afin qu'elles correspondent aux données modifiées de la copie de l'objet.
EP92311577A 1992-01-31 1992-12-18 Système de communication Expired - Lifetime EP0553560B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9202072 1992-01-31
GB9202072A GB2263797B (en) 1992-01-31 1992-01-31 Object orientated system

Publications (3)

Publication Number Publication Date
EP0553560A2 EP0553560A2 (fr) 1993-08-04
EP0553560A3 EP0553560A3 (en) 1993-09-22
EP0553560B1 true EP0553560B1 (fr) 1998-09-02

Family

ID=10709599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92311577A Expired - Lifetime EP0553560B1 (fr) 1992-01-31 1992-12-18 Système de communication

Country Status (12)

Country Link
US (1) US5734902A (fr)
EP (1) EP0553560B1 (fr)
JP (1) JPH05282165A (fr)
CN (1) CN1059747C (fr)
AT (1) ATE170640T1 (fr)
AU (1) AU662784B2 (fr)
CA (1) CA2088429A1 (fr)
DE (1) DE69226858T2 (fr)
DK (1) DK0553560T3 (fr)
ES (1) ES2121829T3 (fr)
FI (1) FI930389A (fr)
GB (1) GB2263797B (fr)

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Also Published As

Publication number Publication date
FI930389A0 (fi) 1993-01-29
EP0553560A2 (fr) 1993-08-04
CN1078336A (zh) 1993-11-10
CN1059747C (zh) 2000-12-20
ATE170640T1 (de) 1998-09-15
GB2263797A (en) 1993-08-04
JPH05282165A (ja) 1993-10-29
DE69226858T2 (de) 1999-01-21
AU3106193A (en) 1993-08-05
CA2088429A1 (fr) 1993-08-01
DE69226858D1 (de) 1998-10-08
FI930389A (fi) 1993-08-01
US5734902A (en) 1998-03-31
DK0553560T3 (da) 1999-05-31
AU662784B2 (en) 1995-09-14
EP0553560A3 (en) 1993-09-22
GB2263797B (en) 1996-04-03
GB9202072D0 (en) 1992-03-18
ES2121829T3 (es) 1998-12-16

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